Intérêt mécanique du caractère pédiculé du DIDT pour une ligamentoplastie du LCA

SFA 2017 - Congrès annuel de la Société Francophone d'Arthroscopie, Marseille, France, 06-/12/2017 - 09/12/2017Le moyen de fixation d'un transplant de ligamentoplastie du ligament croisé antérieur (LCA) reste débattu. La fixation tibiale des greffes tendineuses constitue la faiblesse principale pour des raisons mécaniques et anatomiques. La ligamentoplastie aux ischio-jambiers (DIDT) pédiculés pourrait avoir un intérêt mécanique. L'objectif du travail était d'étudier l'intérêt mécanique du caractère pédiculé du DIDT en comparant la résistance maximale de la fixation tibiale d'une greffe de DIDT pédiculé par vis d'interférence à celle d'un DIDT non pédiculé fixé par vis d'interférence et à celle d'une plastie pédiculée non fixée par vis. L'hypothèse était que le caractère pédiculé de la greffe augmenterait la résistance maximale de la fixation tibiale

Contribution of arthroscopy in the treatment of anterior glenoid rim fractures: a comparison with open surgery

International audienceBACKGROUND: This study assessed the clinical and radiologic outcomes of Ideberg type IA glenoid fractures treated using conventional open surgery compared with those treated with arthroscopic surgery. MATERIALS AND METHODS: This was a retrospective, multicenter study of anterior glenoid rim fractures (Ideberg IA) treated with conventional open surgery (group O) or arthroscopic surgery (group A). Included were 56 patients: 10 in group O and 46 in group A. The patients were reviewed after a minimum of 12 months of follow-up. The Constant score was used as an objective clinical outcome. Radiographs were reviewed to assess the quality of the postoperative reduction, fracture healing, complications, and whether osteoarthritis was present at the last follow-up. RESULTS: At a mean follow-up of 30 months (range, 12-115 months), there was no significant difference between the groups based on the Constant Score (group O: 74 points; group A: 84 points, P = .07). None of the shoulders showed signs of instability. Conversely, the rate of postoperative complications was higher in group O than in group A (30% vs. 4%; P = .03). Glenohumeral osteoarthritis was found in 10% of group O patients and 18% of group A patients (P = .65). CONCLUSIONS: This study shows that anterior glenoid rim fractures have similar functional outcomes, whether treated using conventional open surgery or arthroscopic surgery. Arthroscopic surgery appears to reduce the complication and reoperation rate

Mechanical advantage of preserving the hamstring tibial insertion for anterior cruciate ligament reconstruction - A cadaver study

INTRODUCTION: The best fixation method for an anterior cruciate ligament (ACL) graft is debated. The tibial fixation of tendon grafts is the principal weak point for mechanical and anatomical reasons. Preserving the tibial insertion for hamstring grafts during ACL reconstruction make provide a mechanical benefit. The aim of this study was to compare the strength at the tibial tunnel of a hamstring graft with intact tibial insertion without a screw, to that of a graft with intact tibial insertion and screw fixation, and to that of a free graft with screw fixation. We hypothesized that preserving the graft's tibial insertion increases the maximum resistance of the tibial fixation relative to a free graft. MATERIALS AND METHODS: Five pairs of knees (10 specimens) from frozen human donors were used. The tendons of the semitendinosus and gracilis were prepared as a four-strand graft while preserving their tibial insertion. The graft was passed through the tibial tunnel using standard instrumentation and the usual landmarks. Three conditions were tested: group 1 - graft with intact tibial insertion without interference screw; group 2 - graft with intact tibial insertion and interference screw; group 3 - knees from group 1 in which the tendons were detached (free graft) after the first test and fixed with an interference screw in the tibial tunnel. The screw diameter was chosen based on the graft diameter. The specimens were tested in traction using a materials testing system (Instron® 8500 PLUS) in the axis of the tunnel. The main outcome measure was the maximum load at failure (N). The secondary outcome measure was the stiffness. The groups were compared using the Friedman test and the Nemenyi post-hoc test with a 5% threshold. RESULTS: The load at failure was 33% higher in group 1 than group 3 (89.2N vs. 67.2N, p>0.05). The load at failure of group 2 was 25% higher than group 1 (111.2N vs. 89.2N, p>0.05) and 65% higher than group 3 (111.2N vs. 67.2N p=0.005). There were no differences in stiffness between groups 1 and 2 (p=1). DISCUSSION: Our hypothesis was confirmed-preserving the tibial insertion of hamstring tendons intended for ACL reconstruction increases the maximum load to failure at the tibial tunnel. Under these experimental conditions it seems that adding a screw increases the pullout strength of the graft by +25% in absolute terms; however this difference was not statistically significant. LEVEL OF EVIDENCE: III, controlled laboratory study

Optical Validation of Precast and Reinforced Concrete

Poster Presentation at the SVCP 201

Analysis of current practice and future potentials of LCA in a BIM-based design process in Germany

The construction and building sector, responsible for 39% of global greenhouse gas emissions, is undergoing a fundamental digital transformation enabled by Building Information Modelling (BIM). Integrating life cycle assessment (LCA) in digital building design processes enables early evaluation of embodied impacts. This connection offers opportunities to generate predictive parameters to efficiently use environmental optimization potentials. The aim of this study was to investigate current barriers and incentives for practitioners to use LCA in combination with BIM in practice in Germany. Based on criteria identified in a systematic literature review, a survey amongst 161 practitioners is conducted, analysing five different user profiles. The evaluated criteria are added value, perception of relevance, intention, age, data availability, standardization, external demand and usability. The results present a recognised added value of integrating LCA in BIM from the perspective of all user profiles. Currently, measures in a political and social context have higher potentials, i. e. are more urgent to implement, than measures in the information technology context, whereas priorities vary depending on user profiles. The greatest drivers are external demand and pressure in forms of stricter political requirements and more demand from the public-sector. The presented insights, trends and need for action can support implementing procedures for achieving the urgent climate goals of the construction sector strategically through digital transformation

Extended Proceedings 4th Summer School on Video Compression and Processing (SVCP) 2018

Extended Proceedings 4th Summer School on Video Compression and Processing (SVCP) 201